Post a comment on the text below

Water quality: Urban rivers and lakes have also been heavily polluted in the process of urbanization and industrialisation of the last century. Looking back to the past 25 years, clear progress has been made in reducing emissions into urban rivers and lakes due to connections to sewers, the introduction of wastewater treatment and the upgrading of earlier treatment plants. Improvements in the water quality of urban rivers and lakes due to reduced emissions and wastewater improvement have brought about benefits to river and lake ecology. However, some key challenges still remain with water quality impacts related to stormwater management and historical pollution of sediments.